public object VisitLogicalExpr(LogicalExpr expr)
{
Resolve(expr.Left);
Resolve(expr.Right);
return(null);
}
// logic_and → equality ( "and" equality )* ;
private Expr And()
{
Expr expr = Equality();
while (CheckCurrentToken(TokenType.And))
{
var op = GetCurrentTokenAndAdvance();
Expr right = Equality();
expr = new LogicalExpr(expr, op, right);
}
return(expr);
}
// LogicalAnd -> Equality ( "and" Equality )*
private AstNode LogicalAnd()
{
AstNode expr = Equality();
while (Match(TokenType.AND))
{
Token oper = Previous();
AstNode right = Equality();
expr = new LogicalExpr(expr, oper, right);
}
return(expr);
}
public object Visit_LogicalExpr(LogicalExpr expr)
{
Object left = Evaluate(expr.left);
if (expr.op.type == TokenType.Or)
{
if (IsTruthy(left))
{
return(left);
}
}
else
{
if (!IsTruthy(left))
{
return(left);
}
}
return(Evaluate(expr.right));
}
public object VisitLogicalExpr(LogicalExpr expr)
{
object left = Evaluate(expr.Left);
// Short-circuiting logic
if (expr.Oper.Type == TokenType.OR)
{
if (IsTruthy(left))
{
return(left);
}
}
else
{
if (!IsTruthy(left))
{
return(left);
}
}
return(Evaluate(expr.Right));
}
public Void Visit_LogicalExpr(LogicalExpr expr)
{
Resolve(expr.left);
Resolve(expr.right);
return(null);
}
public string Visit_LogicalExpr(LogicalExpr expr)
{
return(Parenthesize(expr.op.ToText(), expr.left, expr.right));
}